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Question on my math

So in computer science we keep getting pounded with assignments and homework!!

And on one assignment its a parking garage program which asks you how long you parked (in minutes) then charges you 75 cents for each hour. i got that part but if you stay for part of an hour you have to pay for tha full hour. How would i do that? Im off by like 1 minute and have an infinite loop which freezes my computer.